Design Considerations for Energy-Efficient Radios in Wireless Microsensor Networks

In the past few years, wireless microsensor networks have attracted a great deal of attention in the research community. This is due to the applications that will be enabled once wireless microsensor networks are in place. The design of wireless microsensor networks, however, represents a difficult challenge. Since many applications require fault-tolerant, long-term sensing, one important challenge is to design sensor networks that have long system lifetimes. Achieving long system lifetimes is difficult because sensor nodes are severely energy-constrained. In this paper, we demonstrate system-level techniques that adapt and tradeoff software and hardware parameters in response to changes in the requirements of the user, the characteristics of the underlying hardware, and the properties of the environment. By using these power-aware, system-level techniques, we are able to reduce the energy consumption of both general, adaptable systems and dedicated point systems. Moreover, given a specific set of operating conditions for a particular system, we show how energy savings of 50% can be achieved.

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